Interest defined
Explore why interest is the time-value of money.
In this lesson
Interest defined is part of What Is Interest?. This preview shows how interest-growth connects to everyday family decisions such as earning, saving, spending choices, goals, approvals, or parent-guided money conversations inside Progress Penguin.
Think about this money choice
Imagine this situation: You lend a friend 5000 in local currency for 3 months and they return 5500 in local currency.
How it works
Interest is the time-value of money. From the lender's perspective it is income; from the borrower's it is a cost. The same concept — just viewed from different sides.
Apply it to a real decision
Real-life money moment: You save 10000 in local currency at 8% per year. A friend borrows 10000 in local currency at 20% per year.
Activity preview
Connect the ideas
Use the lesson to complete this short practice activity.
Practice adding money to savings
Open Requests and make a deposit request into savings so you can see how saving starts. Parent approval can happen later.
Quiz preview
Interest is best described as:
You lend a friend 5000 in local currency for 3 months and they return 5500 in local currency. What is the 500 in local currency called and what percentage is it?